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In his early years he was fairly popular. Progressives credited him with Liberal ideas and, in addition, his free and easy manners endeared him to the so-called lazzaroni, the lower classes of Neapolitan society.

On succeeding to the throne in 1830, he published an edict in which he promised to give his most anxious attention to the impartial administration of justice, to reform the finances, and to use every effort to heal the wounds which had afflicted the Kingdom for so many years. His goal, he said, was to govern his Kingdom in a way that would bring the greatest happiness to the greatest number of his subjects while respecting the rights of his fellow monarchs and those of the Roman Catholic Church.

However, in 1837 he violently suppressed Sicilian demonstrators demanding a constitution and maintained strict police surveillance in his domains. Progressive intellectuals, who were motivated by visions of a new society founded upon a modern constitution, continued to demand the King to grant a constitution and to liberalize his rule.

After similar revolutionary outbursts in Salerno, south of Naples, and in the Cilento region which were backed by the majority of the intelligentsia of the Kingdom, on 29 January 1848 King Ferdinand was forced to grant a constitution patterned on the French Charter of 1830.

A dispute, however, arose as to the nature of the oath which should be taken by the members of the chamber of deputies. As an agreement could not be reached and the King refused to compromise, riots continued in the streets. Eventually, the King ordered the army to break them and dissolved the national parliament on 13 March 1849. Although the constitution was never formally abrogated, the King returned to reigning as an absolute monarch.

In the meantime, Sicily proclaimed its independence under the leadership of Ruggeru Sèttimu, who on 13 April 1848 declared the King deposed. In response, the King assembled an army of 20,000 under the command of General Carlo Filangieri and dispatched it to Sicily to subdue the Liberals and restore his authority. A naval flotilla sent to Sicilian waters shelled the city of Messina with "savage barbarity" for eight hours after its defenders had already surrendered, killing many civilians and earning the King the nickname "Rè Bomba" ("King Bomb").

After a campaign lasting close to nine months, Sicily's Liberal regime was completely subdued on 15 May 1849.

Between 1848 and 1851, the policies of King Ferdinand caused many to go into exile. Meanwhile, an estimated 2,000 suspected revolutionaries or dissidents were jailed.

After visiting Naples in 1850, Gladstone began to support Neapolitan opponents of the Bourbon rulers: his "support" consisting of a couple of letters that he sent from Naples to the Parliament of London, describing the "awful conditions" of the Kingdom of Southern Italy and claiming that "it is the negation of God erected to a system of government". Gladstone had not actually been to Southern Italy and so some of his accusations were unreliable, but reports of misgovernment in the Two Sicilies were widespread throughout Europe during the 1850s. Gladstone's letters provoked sensitive reactions in the whole of Europe and helped to cause its diplomatic isolation prior to the invasion and annexation of the Kingdom of the Two Sicilies by the Kingdom of Piedmont, with the following foundation of modern Italy.

The British government, which had been the ally and protector of the Bourbon dynasty during the Napoleonic Wars, had already additional interests to limit the independence of the kingdom. It had extensive business interests in Sicily and relied on Sicilian sulfur for certain industries.[1] The King had endeavored to limit British influence, which had begun to cause tension. As Ferdinand ignored the advice of the British and the French governments, those powers recalled their ambassadors in 1856.